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(No Model.) l @sheets-sheet 1.`

A. M. STRUSHOLM. DOWNDRAPT MUFPLE KILN.

No. 508,063. Patented Nov."7, 1893.

073%71/63368 J 71/2/ eze/2a' (No Mode'.) 4 sheets-Sheena.

A. M. STRUSHOLM. DOWNDRAFT MUFFLB KILN.

l No, 508,063. Patented Nov. 7, 1893.

- (No1 Model-.p 4 'sheets-sheet 3.

A. M. STRUSHOLM.. DOWNDRAFT MUFFLB KILN.

.- N-o. 508,063. Patented Nov."7, 1893.

(No Model.) l 4 sheets-sheet 4.

A. M. STRUSHOLM. DOWND'RAPT MUFFLB KILN.

No. 508,063. A' PlatentedNov. 7, .1893.

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' UNITED STATES PATENT OEEIcE.

ANDERS M. srRusnoLMoF wooDBRIDeE, NEW JERSEY, ASSIGNoRTo ROBERT W. LYLE, oF NEW YORK, N. Y.

DOWN DRAFT M U-FFLE-Kl LN.

SPECIFICATION forming part of Letters Patent No. 508,063, dated November '7, 1893. `Application filed .Inne,25, 1892. Serial No. 438,021. (No model.)

To all whom it may concern.-

Be it known that I, ANDERS M. SrRUsHoLM, a citizen of the United States, -residing at Woodbridge, in the county of Middlesex and State of New Jersey, have invented a certain new, useful, and valuable Improvement in Downdraft Mufiie-Kilns, of which the following is a full, clear, and exact description.

This invention is a round down draft mufie kiln for burning high grade clay and terra cotta articles.

Up draft muflle kilns have been constructed but they are not at all practicable on account of the great amount of fuel wasted.

The object of the down draft muffle kiln is to save fuel and at the same time to produce a higher degree of temperature within the kiln.

My invention consists in the peculiar arrangement or combination of the several parts,whereby these objects are accomplished, substantially as hereinafter described and claimed.

In they drawings hereunto annexed, Figure 1 is the ground plan of my improved round kiln. Fig. 2 is a section on line 2-2 of Fig. 1. Fig. 3 is a floor plan, and Fig. 4 is a section on line 4-4 of Fig'. 3. Fig. 5 is a perspective view showing the manner of arranging the bricks in the inner or muflle wall.

This round kiln is very similar to my square down draft mufiie kiln for which I filed an application on .I une 18, 1892, Serial No. 437,142, and in constructing my round down draft kiln, I employ a foundation of .concrete orother Suitable material. A central well hole is constructed in theV center of the foundation and from this well leads a passage 35 to the smoke stack.

34 indicates the casing of the well hole.

Four courses of lire brick 33 are laid upon the foundation and at the outer edge of this are built the furnaces 1, said furnaces having arches 15 upon which are built the kiln walls 25, of any suitable height. The walls between the furnaces are built with transverse and longitudinal 'air passages 2, which supply air to the furnaces andk also` prevent the ire brick lining 14, from being burned away. Upon the courses of brick 33 are placed the ilue blocks 5, in definite positions and among these blocks is built aV circular wall 6. An

arch way 7, is built over the well hole as clearly shown. The blocks 5, wall 6 and arch `'7 support the kiln floor 10, 11 and it will be noticed that near the f u rnaces the floor is built 55 with an extra layer 12, to prevent said door' becoming too hot and being burned away.

The kiln walls 25 are provided with a lining 3, of fire brick and this lining 3 is in turn provided with a mufle-face or wall 4 which 6o serves as a mufde and also protects the re brick lining 3 which is part ofthe kiln wall and cannot therefore be easily repaired when burned out, but the tire brick mufde walls 4 and 13 can be easily repaired, always keep- 65 Varched wall 2,3, thus providing a crown space between the two arched walls into which pro- 75 ducts of combustion pass from between the muftle walls.

24 indicates a jacket wall to prevent the radiation of heat.

Four chimneys 8 are built within the kiln 8o and extend from the floor to the lower arch helping to support said arch. These chimneys rest directly over the circular wall 6, which divides the chimney diagonally as clearly shown inFig. l, and upon this wall 6 85 is built within the chimney the partition walll 2l. The outer sides of the chimneys are made thicker than the inner sides as they are nearer the furnace.

, 9 indicates a cool air passage produced in 9o the walls of the kiln adjacent to the door to prevent the floor becoming too hot and being burned away, and similar passages 36 and 37 are arranged near the central and upper portions of the kiln respectively.

16 indicates the gratev bars, 18 the bars upon which they rest and 27 a slab across the face of furnace to which the door 32 is hinged, said door being operated by the chain` and weight, the same as the door of my square roo kiln.

A cooling iue 38 is arranged-above the kiln,

(See Fig. 5.) An in- 7o the same as in my square kiln and all the fines and dampers connected therewith are substantially of the same construction as those shown in my other application.

In operation, the articles are arranged within the kiln entrance beinghad through a door at one side. The door is then closed and the furnace fires started. The passages 2 aid combustion and also prevent the liningsla being burned away. The products of combustion pass up between the walls 4 and 13 and also under the floor until they meet the wall 6. This wall directs it up the chimney into the crown space where they meet the products from the muiiie walls and both combine and descend theother side of chimney through the arch way 7 down the center well into the smoke passage 35.

The operation of the other parts is the same as in my other application and a detailed desheripton here is unnecessary.

Having thus described my invention, what I claim isl. The combination with the foundation having a well-hole arranged centrally thereof, of the liuc-blocks supported on the foundation, the inner and outer mufile-walls having [lues formed between them, and the furnaces arranged on the outside of the kiln and cornmunicating withlthe said tlues.

2. The combination with the foundation of the flue-blocks supported thereon, inner and outer muflie-walls havingr ilues formed be tween them, furnaces arranged within the kiln walls and communicating with the said lues, and double crown-walls supported on the muiie-walls and the kiln-walls.

3. The combination with the foundation of the liuc-blocks supported thereon, inner and outer mutile-walls having tlues formed between them, furnaces arranged within the kiln walls and communicating with the said fines, double crown-walls supported o n the munie-walls and the kiln-walls, a center well arranged below the floor of the furnace, and the smoke passage.

4. In a circular down-draft mufiie-kiln, the combination with the kiln-walls, of the furnaces built therein, hollow muflie-walls arranged contiguous to the kiln-walls, crownwalls supported on the kiln-walls and the muffie-walls, a floor, a center-well located below the floor, and a series of chimneys con-' necting the said well and the crown-space between the crown-walls, substantially as described. A

In testimony whereof I aiiix my signature 1n presence of two witnesses.

ANDERS M. STRUSHOLM. Witnesses:

JAS. H. VoRis, R. F. GARDNER, Jr. 

